Cod sursa(job #76092)
Utilizator | Data | 7 august 2007 22:30:24 | |
---|---|---|---|
Problema | Factorial | Scor | 45 |
Compilator | c | Status | done |
Runda | Arhiva de probleme | Marime | 0.46 kb |
#include<stdio.h>
int calc(int n)
{int nr=0;
while(n%5==0)
{
n/=5;
nr++;
}
return nr;
}
int main()
{
long p,i=0,s=0;
FILE *f;
f=fopen("fact.in","r");
fscanf(f,"%li",&p);
for(;;)
{
if(s==p || s>p) break;
else
{
i+=5;
s+=calc(i);
}
}
f=fopen("fact.out","w");
if(s==p) fprintf(f,"%li",i);
else fprintf(f,"%s","-1");
return 0;
}